that phosphate Stuff can only be left in for two days at a time is that correct and will that have to be done All The Time To Keep the level down ?????
it depends on the brand i know that kent, seachem, tropicmarin and two little fishies allow you to keep it in as long as you like. they say it will not leach back out. but the best thing to do is follow the manufactures instructions.
to answer your second question; i dont know. but i do know this. i want my phosphates and silicates as low as possible so im using phosguard full time. i can tell when its exausted just by looking at the few tufts of hair algae lying around.
by the way sea chem is the best priced and they give you more than they have listed. a 600g can actualy has 900g in it.